Yamaha T9.9 no power to starter

Jomi

Recruit
Joined
Aug 25, 2026
Messages
1
Yamaha T9.9 4 stroke electric start. The motor was working great the day before. When I went to start it the next day, nothing happend when I pushed the start button. Power tilt works, battery is fully charged and capable of starting the big motor 125 hp mercury outboard. 9.9 outboard will not start, won't even turn over. When I push the start button, no sound is heard, no clicking nothing. Emergency kill switch is fully attached. Transmission is in neutral. I've checked and rechecked battery terminals as well as positive and ground connections to the motor (12.7volts at the motor). Any help would be much appreciated.
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,307
Check for 12+ to the start device(button or key switch) to make sure that has power.
if it does not trace the wiring back to see where it is being lost.
if it does have 12V+ then chase in the other direction if the other side of switch gets power when operated
 
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